A. Since this has been going on for a week, I recommend getting your pet in to be seen by your veterinarian right away. The pink color you're seeing is probably blood from having vomited so much that his stomach and/or esophagus is so irritated that it's bleeding. Continued vomiting is very concerning and can lead to dehydration and electrolyte imbalance as well as low blood sugar. He might have eaten something that either disagreed with him or something that has gotten stuck somewhere in his gastrointestinal tract. He could be sore from a hidden injury you are unaware of, he could have been exposed to some sort of toxin or irritant in his environment or this could be early signs of another condition or disease process. Your pet may need IV fluids to help support his/her system and to be fasted at the same time in order to give the gut a rest. Your vet can do an exam, blood work and possibly x-rays to determine the cause of the illness and suggest an effective treatment plan.
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